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How to avoid warning when introducing NAs by coercion
I generally prefer to code R so that I don't get warnings, but I don't know how to avoid getting a warning when using as.numeric to convert a character vector.
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'typeid' versus 'typeof' in C++
I am wondering what the difference is between typeid and typeof in C++. Here's what I know:
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Booleans, conditional operators and autoboxing
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What's the opposite of head? I want all but the first N lines of a file
Given a text file of unknown length, how can I read, for example all but the first 2 lines of the file? I know tail will give me the last N lines, but I don't know what N is ahead of time.
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Rails.env vs RAILS_ENV
I see both in examples when checking what env one is running in. What's preferred? Are they, for all intents and purposes equal?
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Is it possible to adjust x,y position for titleLabel of UIButton?
Is it possible to adjust the x,y position for the titleLabel of a UIButton ?
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Disable IntelliJ Starred (Package) Imports?
I'm a migrating Eclipse IDE user and am learning my way round IntelliJ IDEA 9.
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How do I show a MySQL warning that just happened?
I just ran a simple MySQL CREATE TABLE statement that produced the line
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How can I use “puts” to the console without a line break in ruby on rails?
I have a method which goes through a loop -- I want it to output a "." each loop so I can see it in the console. however, it puts a linebreak at the end of each when I use puts "." .
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How to replace a whole line with sed?
Suppose I have a file with lines
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